pallium

noun

1. the layer of unmyelinated neurons (the grey matter) forming the cortex of the cerebrum
2. (zoology) a protective layer of epidermis in mollusks or brachiopods that secretes a substance forming the shell
3. (Roman Catholic Church) vestment consisting of a band encircling the shoulders with two lappets hanging in front and back
4. cloak or mantle worn by men in ancient Rome